21130039 has 8 divisors (see below), whose sum is σ = 24375168. Its totient is φ = 17941560.

The previous prime is 21130037. The next prime is 21130049. The reversal of 21130039 is 93003112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21130039 - 2¹ = 21130037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21129998 and 21130025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13357 + ... + 14854.

It is an arithmetic number, because the mean of its divisors is an integer number (3046896).

Almost surely, 2^21130039 is an apocalyptic number.

21130039 is a deficient number, since it is larger than the sum of its proper divisors (3245129).

21130039 is a wasteful number, since it uses less digits than its factorization.

21130039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28325.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 21130039 is about 4596.7422159612. The cubic root of 21130039 is about 276.4607188153.

The spelling of 21130039 in words is "twenty-one million, one hundred thirty thousand, thirty-nine".